By normal condition (20°C/68°F) and 80 % RH) Herculan polyurethane underlay quickly attains a high surface strength and is walkable after 16-24 hours, depending of temperature. Final covering can be applied after 24 hours.

Note that the curing time depends on the substrate temperature and the ambient air temperature of the working area as well as the relative humidity. All Herculan Polyurethane Underlay products meet all requirements according to IMO FTP Code 2010 part 5.